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Semtech Corporation SC4525ASETRT
- Part No.:
- SC4525ASETRT
- Manufacturer:
- Semtech Corporation
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
SC4525ASETRT.pdf
- Description:
- IC REG BUCK ADJ 3A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,525
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Product details
Overview
SC4525ASETRT from Semtech is a 8V–28V input, 3A synchronous step-down switching regulator with peak current-mode control, programmable 200kHz–2MHz switching frequency, and precision 1.000V feedback reference. It integrates a 28V/3.6A NPN power transistor in an SOIC-8 EDP package and delivers regulated DC output for point-of-load power in XDSL modems and LCD TVs.
For engineers reviewing the SC4525ASETRT datasheet, pinout, applications, or equivalent options, key selection criteria include its hiccup-mode overload protection, thermal shutdown at 165°C, cycle-by-cycle current limiting, soft-start functionality via external capacitor, and compatibility with ceramic output capacitors down to 22µF.
Technical Context
The SC4525ASETRT employs constant-frequency peak current-mode PWM control with an internal 4.1mΩ current-sense resistor and slope compensation to stabilize the inner current loop. Its transconductance error amplifier (280 µ℧⁻¹) drives the COMP pin to regulate output voltage via external resistive divider.
Frequency is set by an external ROSC-to-ground resistor (e.g., 12.1kΩ yields 1.04–1.56MHz); foldback occurs when FB < 0.8V to improve short-circuit robustness. The BST pin requires external bootstrap diode/capacitor to drive the NPN base above VIN for low VCE(SAT) (380–600mV at –3.9A).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 8V to 28V - supports wide industrial and telecom input rails including 12V and 24V systems. |
| Output Current | 3A continuous - sufficient for DSP cores, SoC I/O rails, and display logic supplies. |
| Switching Frequency | 200kHz to 2MHz - enables compact magnetics and ceramic capacitors; 1MHz typical for 5V/3A designs. |
| Feedback Voltage | 1.000V ±20mV - high-precision reference enabling accurate output regulation across temperature (±0.02V drift from –40°C to 125°C). |
| Current Limit Threshold | 3.9A to 6.6A - cycle-by-cycle protection prevents damage during transient overloads without latch-off. |
| Thermal Shutdown | 165°C with 10°C hysteresis - protects against sustained overtemperature in enclosed or high-ambient environments. |
| Package | SOIC-8 EDP with exposed thermal pad - 36°C/W junction-to-ambient thermal resistance on 4-layer FR4 PCB with thermal vias. |
Pinout & Package
SC4525ASETRT is housed in a thermally enhanced SOIC-8 EDP (Exposed Drain Pad) package. The exposed pad must be soldered to the PCB ground plane for optimal thermal performance and electrical stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SW | Emitter of internal NPN power transistor | Connects to inductor, freewheeling diode cathode, and bootstrap capacitor - carries full load current and switching node transitions. |
| 2 IN | Power supply input / collector of NPN transistor | Primary input rail connection; must be bypassed near pin with low-ESR ceramic capacitor to suppress high-frequency noise. |
| 3 ROSC | Oscillator frequency programming node | External resistor to ground sets switching frequency; 12.1kΩ yields ~1.3MHz typical - critical for EMI and component size trade-offs. |
| 4 GND | Analog and power ground reference | Common return for feedback, error amplifier, and internal bias - must be tied directly to exposed pad and low-impedance ground plane. |
| 5 SS/EN | Soft-start timing and enable control | Capacitor to ground sets startup ramp time; voltage thresholds control hiccup mode arming (2.15V) and shutdown (<0.2V). |
| 6 COMP | Error amplifier output | Drives peak switch current; requires Type-2 RC network (R7/C5/C8) for stable loop compensation - direct interface to control loop design. |
| 7 FB | Inverting input of error amplifier | Monitors output via resistive divider; 1V reference enables precise VO = 1V × (1 + R4/R6); <0.8V triggers frequency foldback. |
| 8 BST | Bootstrap supply for NPN base drive | Requires external diode + capacitor to generate >VIN gate drive - ensures low VCE(SAT) and high efficiency at high duty cycles. |
Key Features
| Feature | Design Value |
|---|---|
| Peak current-mode control | Enables fast transient response and simplified Type-2 compensation - eliminates need for complex multi-pole networks in point-of-load designs. |
| Hiccup-mode overload protection | Shuts down and auto-retries during persistent overcurrent or short circuit - limits average power dissipation and avoids thermal runaway. |
| Programmable switching frequency | 200kHz–2MHz range allows optimization for efficiency (low fSW) or miniaturization (high fSW) without changing IC or layout. |
| Integrated 28V/3.6A NPN transistor | Eliminates external high-side switch and associated gate driver - reduces BOM count and PCB area in non-synchronous buck topologies. |
| Thermally enhanced SOIC-8 EDP | Exposed pad lowers thermal resistance to 5.5°C/W junction-to-case - enables 3A operation at ambient up to 85°C with minimal heatsinking. |
Applications
| XDSL Modem Power Supply | LCD TV Point-of-Load |
|---|---|
|
Use Scenario: Provides stable 3.3V/3A rail for DSL PHY and controller ICs in compact residential gateway units. IC Role / Device Role / Timing Role: Primary non-synchronous buck regulator converting 12V intermediate bus to low-voltage logic supply. Use Value: Programmable 1MHz switching enables small 5.2µH inductor and 22µF ceramic output cap - meets space constraints in fanless enclosures. |
Use Scenario: Generates 5V/3A for TCON (timing controller) and backlight driver logic in 32"–55" LCD panels. IC Role / Device Role / Timing Role: High-current step-down regulator operating from 12V or 24V main board supply. Use Value: Hiccup protection prevents catastrophic failure during backlight short circuits; thermal shutdown guards against prolonged panel-on operation. |
| Set-Top Box SoC Core Supply | CPE Equipment DSP Power |
|
Use Scenario: Delivers tightly regulated 1.2V/3A to ARM-based SoC cores under dynamic load transients from video decoding. IC Role / Device Role / Timing Role: Secondary buck converter downstream of primary 5V rail, using external feedback divider. Use Value: Peak current-mode control achieves <5% output deviation during 2A step load changes - maintains SoC stability without external LDO post-regulation. |
Use Scenario: Powers fixed-point DSPs in cable modem termination systems requiring clean 2.5V/3A with low ripple. IC Role / Device Role / Timing Role: Dedicated buck regulator with dedicated input decoupling and isolated ground routing. Use Value: Precision 1.000V FB reference and low-drift error amplifier ensure <±1% output accuracy across –40°C to 85°C - meets DSP analog interface specs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2332HG-LL-Z (Monolithic Power) | 4.5V–28V input, 3A, synchronous buck; no integrated bootstrap diode; requires external high-side MOSFET gate driver. | Supports higher efficiency (>92%) at light loads due to synchronous rectification; lacks hiccup mode - uses latched shutdown. | Choose MP2332HG-LL-Z when efficiency >90% across 10mA–3A is critical and board space allows discrete FET layout. |
| TPS54332DR (Texas Instruments) | 3.5V–28V input, 3A, integrated N-channel FET; 500kHz–2.5MHz frequency; 0.8V FB reference; no hiccup mode. | Lower minimum input voltage enables single-rail 5V system use; smaller 8-pin SOIC (non-EDP) limits thermal headroom at full 3A. | Choose TPS54332DR for designs needing 0.8V FB flexibility or tighter input range; verify thermal margin with 36°C/W vs SC4525ASETRT's 36°C/W on same PCB. |
Compared with MP2332HG-LL-Z and TPS54332DR, SC4525ASETRT offers unique hiccup-mode protection and integrated NPN with bootstrap drive - making it preferable for unattended CPE equipment where fault recovery without manual reset is required.
Availability
SC4525ASETRT is available at Aetrix Electronics and suitable for XDSL modems, LCD TV power supplies, and CPE equipment requiring stable component supply, RoHS-compliant packaging, and long-term industrial availability.
Supply support for SC4525ASETRT includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Semtech Corporation is a U.S.-based semiconductor company specializing in analog and mixed-signal ICs for power management, protection, and signal integrity.
The SC4525ASETRT belongs to Semtech's SC45xx family of high-voltage step-down regulators designed for telecom, broadband, and consumer display applications demanding robust overload handling and thermal resilience.
FAQ
What is the absolute maximum input voltage rating for SC4525ASETRT?
The SC4525ASETRT has an absolute maximum VIN rating of 32V. Exceeding this voltage may cause permanent damage. The recommended operating range remains 8V to 28V per datasheet specifications, with start-up occurring at 2.70–2.95V VIN and UVLO hysteresis of 225mV. Always maintain input transient suppression below 32V.
Does SC4525ASETRT support synchronous rectification?
No, SC4525ASETRT does not support synchronous rectification. It integrates a single NPN power transistor and requires an external Schottky freewheeling diode (e.g., 20BQ030) connected between SW and GND. This non-synchronous architecture simplifies design but limits peak efficiency compared to synchronous buck controllers.
How is hiccup-mode overload protection enabled on SC4525ASETRT?
Hiccup-mode protection on SC4525ASETRT activates automatically when the SS/EN pin voltage exceeds 2.15V during startup. Once armed, persistent overcurrent causes the soft-start capacitor to discharge below 1.9V, triggering shutdown and automatic retry after discharge to 1.0V. No external components are needed beyond the SS/EN capacitor.
What is the minimum recommended output capacitance for SC4525ASETRT?
The minimum recommended output capacitance for SC4525ASETRT is 22µF X5R ceramic. This value ensures stable regulation and acceptable output ripple (<50mV p-p) under full 3A load at 1MHz switching. Lower values risk instability or excessive ripple; Z5U/Y5V dielectrics are discouraged due to voltage/temperature coefficient drift.
Can SC4525ASETRT operate with an input voltage below 8V?
No, SC4525ASETRT is not specified to operate below 8V input. While VIN start-up threshold is 2.70–2.95V, the device requires ≥8V to sustain 3A output current and meet all electrical characteristics. Operation below 8V results in undefined behavior, reduced current capability, and potential dropout - use only within the 8V–28V recommended range.
SC4525ASETRT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 8V
- Voltage - Input (Max):
- 28V
- Voltage - Output (Min/Fixed):
- 1V
- Voltage - Output (Max):
- 22.4V
- Current - Output:
- 3A
- Frequency - Switching:
- 200kHz ~ 2MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC, EDP
SC4525ASETRT FAQ
1.How can I place an order for SC4525ASETRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SC4525ASETRT on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SC4525ASETRT reliable?
The price and inventory of SC4525ASETRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC4525ASETRT is usually 5 days.
3.What payment methods are accepted for SC4525ASETRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC4525ASETRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC4525ASETRT?
SC4525ASETRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC4525ASETRT order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SC4525ASETRT?
For technical support, including SC4525ASETRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC4525ASETRT requirements.
6.How does Aetrix verify that SC4525ASETRT is sourced from the original manufacturer or authorized distributors?
All SC4525ASETRT products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SC4525ASETRT meets industry standards.
7.What is the process for return or replacement of SC4525ASETRT?
All SC4525ASETRT units undergo pre-shipment inspection (PSI). If there is an issue with SC4525ASETRT, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SC4525ASETRT part is unused and in its original packaging.
Return procedure for SC4525ASETRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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